nimbus-eth1/nimbus/vm2/state_transactions.nim

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# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except
# according to those terms.
# This source must have the <vm2_enabled> compiler flag set.
#
# why:
# ../config, ../transaction, etc include ../vm_* interface files which in
# turn will refer to the ../vm/* definitions rather than ../vm2/* unless the
# <vm2_enabled> compiler flag is set.
#
when not defined(vm2_enabled):
{.error: "NIM flag must be set: -d:vm2_enabled".}
import
../config,
../constants,
../db/accounts_cache,
../transaction,
./computation,
./interpreter_dispatch,
./interpreter/[forks_list, gas_costs, gas_meter],
./message,
./state,
./types,
chronicles,
eth/common,
eth/common/eth_types,
options,
sets
proc setupTxContext*(vmState: BaseVMState, origin: EthAddress, gasPrice: GasInt, forkOverride=none(Fork)) =
## this proc will be called each time a new transaction
## is going to be executed
vmState.txOrigin = origin
vmState.txGasPrice = gasPrice
vmState.fork =
if forkOverride.isSome:
forkOverride.get
else:
vmState.chainDB.config.toFork(vmState.blockHeader.blockNumber)
vmState.gasCosts = vmState.fork.forkToSchedule
proc setupComputation*(vmState: BaseVMState, tx: Transaction, sender: EthAddress, fork: Fork) : Computation =
var gas = tx.gasLimit - tx.intrinsicGas(fork)
assert gas >= 0
vmState.setupTxContext(
origin = sender,
gasPrice = tx.gasPrice,
forkOverride = some(fork)
)
let msg = Message(
kind: if tx.isContractCreation: evmcCreate else: evmcCall,
depth: 0,
gas: gas,
sender: sender,
contractAddress: tx.getRecipient(sender),
codeAddress: tx.to,
value: tx.value,
data: tx.payload
)
result = newComputation(vmState, msg)
doAssert result.isOriginComputation
proc refundGas*(c: Computation, tx: Transaction, sender: EthAddress) =
let maxRefund = (tx.gasLimit - c.gasMeter.gasRemaining) div 2
c.gasMeter.returnGas min(c.getGasRefund(), maxRefund)
c.vmState.mutateStateDB:
db.addBalance(sender, c.gasMeter.gasRemaining.u256 * tx.gasPrice.u256)
proc execComputation*(c: Computation) =
if not c.msg.isCreate:
c.vmState.mutateStateDB:
db.incNonce(c.msg.sender)
c.execCallOrCreate()
if c.isSuccess:
c.refundSelfDestruct()
shallowCopy(c.vmState.suicides, c.suicides)
shallowCopy(c.vmState.logEntries, c.logEntries)
c.vmState.touchedAccounts.incl c.touchedAccounts
c.vmstate.status = c.isSuccess